/**
 * @(#) Project: schtech Modify Information:
 *      ======================================
 *      ======================================= Author Date Description
 *      ------------ ---------- --------------------------------------------
 *      name 2014年2月26日 description Copyright Notice:
 *      ============================
 *      ================================================= Copyright 2014 Schtech
 *      Software, Inc. All rights reserved. This software is the confidential
 *      and proprietary information of Shenzhen SCHTECH Software Co., Ltd.
 *      ("Confidential Information"). You shall not disclose such Confidential
 *      Information and shall use it only in accordance with the terms of the
 *      license agreement you entered into with Schtech. Warning:
 *      ================
 *      =============================================================
 */
package net.schtech.source.base.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * <p>
 * <strong>Description:</strong> 编码过滤器，解决乱码问题
 * </p>
 * 
 * @Company 深圳盛创汇科技有限公司
 * @author <a href="mailto: duanxuhua@163.com">段绪华</a>
 * @version 1
 * @Copyright Copyright 2014, Shenzhen Schtech Co., Ltd. All right reserved.
 */
public class SetCharacterEncodingFilter implements Filter {

    protected String encoding = null;

    protected FilterConfig filterConfig = null;

    protected boolean ignore = true;

    /**
     * <p>
     * <strong>Description:</strong> 方法功能中文描述
     * </p>
     * 
     * @author <a href="mailto: duanxuhua@163.com">段绪华</a>
     * @update 日期: 2014年2月26日 <a href="mailto: xxx@xx.xx">作者中文名</a> 变更描述
     */

    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }

    /**
     * <p>
     * <strong>Description:</strong> 方法功能中文描述
     * </p>
     * 
     * @param arg0
     * @param arg1
     * @param arg2
     * @throws IOException
     * @throws ServletException
     * @author <a href="mailto: duanxuhua@163.com">段绪华</a>
     * @update 日期: 2014年2月26日 <a href="mailto: xxx@xx.xx">作者中文名</a> 变更描述
     */

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // Conditionally select and set the character encoding to be used
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null)
                request.setCharacterEncoding(encoding);
        }
        chain.doFilter(request, response);
    }

    /**
     * <p>
     * <strong>Description:</strong> 方法功能中文描述
     * </p>
     * 
     * @param arg0
     * @throws ServletException
     * @author <a href="mailto: duanxuhua@163.com">段绪华</a>
     * @update 日期: 2014年2月26日 <a href="mailto: xxx@xx.xx">作者中文名</a> 变更描述
     */

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
        String value = filterConfig.getInitParameter("ignore");
        if (value == null)
            this.ignore = true;
        else if (value.equalsIgnoreCase("true"))
            this.ignore = true;
        else if (value.equalsIgnoreCase("yes"))
            this.ignore = true;
        else
            this.ignore = false;

    }

    protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }

}
